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Higher count rates could be achieved by use of graphite targets and preliminary studies of graphitization of small samples are also reported. AB - Techniques of sample preparation of milligram-sized samples for 14C determinations by tandem accelerator mass spectrometry are reported.Precisions of better than ±2% in measurement of 14C/13C on a single target, an iron-carbon bead containing about a milligram of carbon can be achieved in about one hour's actual measurement time on the target.About one carbon nucleus in a trillion contains two extra neutrons, giving a mass of 14.This carbon-14 is radioactive and decays with a half-life of 5730 years.Standard materials with known 14C/13C ratios are measured in the same way. High precision data can be achieved by much longer counting times up to 4 h, often on several targets. Higher count rates could be achieved by use of graphite targets and preliminary studies of graphitization of small samples are also reported. Our laboratory is well-known for its work on dating many objects of general as well as scientific interests.

PY - 1983/12/15Y1 - 1983/12/15N2 - Techniques of sample preparation of milligram-sized samples for 14C determinations by tandem accelerator mass spectrometry are reported.

Email addresses listed on these WWW pages are for AMS-related correspondence only.

Unsolicited bulk commercial email to these addresses is not acceptable, and permission is not granted to include them in any for-profit list of email addresses automatically or manually harvested from WWW sites.

For historical reasons, uncalibrated radiocarbon measurements are often referred to a half-life of 5568 years.

However, this inconsistency is corrected during calibration [the reason for using the (Willard F.) Libby half-life of 5568 years instead of the correct one of 5730 years has to do with the finding in about 1962 that the true half-life was 573030 years.




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